fix: keep the server_url path when splitting PDFs

[CyMule]

What

PDF splitting now works when server_url includes a path, such as a self-hosted API behind /deployment.

server_url="https://host/deployment", split_pdf_page=True

Before: GET https://host/general/docs             → 404, partition fails
After:  GET https://host/deployment/general/docs  → 200, pages processed

Why

Before sending the split page requests, the SDK makes one extra request to the API. It built that URL from the host alone, dropping any path in server_url. It now builds that URL from the actual partition request, so a path in either the client's server_url or a per-call server_url is kept. The page requests themselves already used the right URL.

The helper that built the old URL has no other callers, so it is removed along with its test.

Validation

Offline tests cover sync and async calls, with and without a per-call server_url, and plain, nested, and URL-encoded paths. Unit tests, pylint, and mypy pass. Adds a CHANGELOG entry and bumps the version to 0.46.3.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-07T15:46:23.649166Z	f2d0372	Draft marked ready

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[cubic-dev-ai]

No issues found across 7 files

<sub>Shadow auto-approve: would not auto-approve. This PR does not meet the repository auto-approval settings.

View guided diff | Re-trigger cubic</sub>

[cragwolfe]

Oracle Pro review of exact head f2d0372ce6c6b8f55f7950a6fb946ac084eff619.

No concrete actionable defects found. I verified the URL change against the SDK's partition URL construction and split hook: it preserves the encoded deployment prefix, uses the actual per-call request URL, and keeps routing state local to each request. The checked-in sync/async tests cover default and per-call URLs, nested and encoded paths, and split/unsplit requests. Existing memory and concurrency behavior is unchanged by this diff.

Exact-head CI: unit, integration, contract, platform integration, lint, CodeQL and security checks succeeded; Claude was skipped. No local tests were run. Oracle's completed browser verdict was SAFE TO MERGE; Pro was confirmed before submission and during processing. The CLI capture timed out, so the completed response was retained directly from the original browser conversation.

(authored by codex)